package com.funong.matrix.core.utils.zip;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Arrays;
import java.util.List;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @author NaNa
 * @since 2020-12-02 11:55
 */
public class ZipCompressorUtil {
    static final int BUFFER = 8192;

    public static void compress(List<String> pathNameList, File zipFile) {
        ZipOutputStream out = null;
        try {
            FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
            CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,
                    new CRC32());
            out = new ZipOutputStream(cos);
            String basedir = "";
            for (int i = 0; i < pathNameList.size(); i++) {
                compress(new File(pathNameList.get(i)), out, basedir);
            }
            out.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void compress(String srcPathName, File zipFile) {
        File file = new File(srcPathName);
        if (!file.exists()) {
            throw new RuntimeException(srcPathName + "不存在！");
        }
        try {
            FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
            CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,
                    new CRC32());
            ZipOutputStream out = new ZipOutputStream(cos);
            String basedir = "";
            compress(file, out, basedir);
            out.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static void compress(File file, ZipOutputStream out, String basedir) {
        /* 判断是目录还是文件 */
        if (file.isDirectory()) {
            System.out.println("压缩：" + basedir + file.getName());
            compressDirectory(file, out, basedir);
        } else {
            System.out.println("压缩：" + basedir + file.getName());
            compressFile(file, out, basedir);
        }
    }

    /**
     * 压缩一个目录
     */
    private static void compressDirectory(File dir, ZipOutputStream out, String basedir) {
        if (!dir.exists()){
            return;
        }
        File[] files = dir.listFiles();
        for (int i = 0; i < files.length; i++) {
            /* 递归 */
            compress(files[i], out, basedir + dir.getName() + "/");
        }
    }

    /**
     * 压缩一个文件
     */
    private static void compressFile(File file, ZipOutputStream out, String basedir) {
        if (!file.exists()) {
            return;
        }
        try {
            BufferedInputStream bis = new BufferedInputStream(
                    new FileInputStream(file));
            ZipEntry entry = new ZipEntry(basedir + file.getName());
            out.putNextEntry(entry);
            int count;
            byte data[] = new byte[BUFFER];
            while ((count = bis.read(data, 0, BUFFER)) != -1) {
                out.write(data, 0, count);
            }
            bis.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) throws Exception {
        List<String> pathNameList = Arrays.asList("E:/resource/js", "E:/resource/css", "E:/resource/images");
    }
}
